He's not just a critic, he's critical of everyone.
He doesn't just critique things for a living, he's critical of everyone because it's in his nature.
この場合、次のような言い方ができますよ。
ーHe's not just a critic, he's critical of everyone.
「彼はただの評論家でははく、全ての人に対して批判的だ」
ーHe doesn't just critique things for a living, he's critical of everyone because it's in his nature.
「彼は評論を仕事にしているだけでなく、生まれつき全ての人に批判的だ」
ご参考まで！
カナダ 
